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The rotate() is the method of HTML CANVAS
The rotate() method is used to rotate the current diagram.

Syntax for rotate() Method in HTML5 Canvas:

context.rotate(angle);

Parameter values for rotate() Method in HTML5 Canvas:

Parameter	Description
angle	The rotation angle, in radians.

Sample Coding for rotate() Method in HTML5 Canvas:

Tryit<!DOCTYPE html>
<html>
    <head>
      <title>wikitechy-rotate() method in canvas</title>
    </head>
    <body>
        <h2>wikitechy-rotate()method in canvas</h2>
        <canvas id="wikitechyCanvas" width="300" height="150" 
        style="border:1px solid #d3d3d3;">
        </canvas>
        <script>
            var canvas = document.getElementById("wikitechyCanvas");
            var context = canvas.getContext("2d");
            context.rotate(20 * Math.PI / 180);
            context.fillRect(50, 20, 100, 50);
       </script>
    </body>
</html>

Code Explanation for rotate() Method in HTML5 Canvas:

rotate() method in HTML5 canvas Code Explanation

”wikitechyCanvas” is used to define the id attribute value for canvas element.
The getElementById(); method is used to get the element that has the id attributes value as “wikitechyCanvas”.
canvas.getContext() method returns an object that provides methods and properties for drawing two dimension figure on the canvas
The beginPath() method is used to begins the path for a line.
mak.lineWidth is used to set a line width as 10.
The context.rotate() method is used to rotate a diagram at (20 * Math.PI / 180) radiant.
The context.fillRect() method is used to draw a "filled" rectangle. (50, 20, 100, 50);